Method for concentrating extremely low-grade refractory magnetite

Abstract

The invention discloses a method for concentrating extremely low-grade refractory magnetite to achieve higher-grade iron ore concentrate. The process proposal comprises the following steps of: dry type magnetic separation and tailing rejecting, stage grinding, wet type magnetic separation, magnetic concentrate fine screening classification, minus sieve magnetic separation, plus sieve regrinding and recleaning and concentrate extraction directly through magnetic separation of an electromagnetic wreathed column. Namely, on the basis of conducting stage grinding separation on crude ore, electromagnetic concentration, fine screening and plus sieve regrinding and recleaning are implemented to improve the final iron ore concentrate grade. With the method adopted, the production cost is reduced,the concentrate grade is raised up to 71.96 percent, the tailings grade is decreased to 4.50 percent and the secondary pollution to the environment is also avoided.

Description

technical field

[0001] The invention relates to a beneficiation technology, in particular to a beneficiation method of extremely low-grade refractory magnetite and a beneficiation equipment thereof. Background technique

[0002] The southern section of the Wuji Iron Mine in Huoqiu County is a large-scale iron ore deposit, mainly composed of primary magnetite, oxidized hematite and less limonite. The total geological reserves are 235 million tons, including 30.9 million tons of 122b grade reserves, the extremely low grade is 20% lower than the cut-off grade, and the geological reserves of iron ore are 31.725 million tons. =12-18) extremely low-grade refractory metal ore.

[0003] The original processing plant adopts the technological process of "pre-classification, open-circuit long barrel mill, stage grinding, and stage separation", and adopts two-stage grinding-three-stage fine screen-two-stage magnetic separation. After many years of mining, the proportion of ore that is...

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